FOXBOROUGH, Mass. -- The Patriots could be making a change at right cornerback for Sunday's game against the Bills.

Second-year player Darius Butler has started at that spot in the first two weeks of the season, but he didn't take all the repetitions with the first unit this week.

Second-year cornerback Kyle Arrington had replaced Butler for the final series against the Jets, and he would be a top candidate to replace Butler if the Patriots make the switch for Sunday's game.

Butler was asked Friday how he's bounced back from a performance that didn't meet his own standards, as he was penalized twice for pass interference on the Jets' final touchdown drive.

"If you go out there and play without confidence, especially at cornerback, you won't last," he said. "It was a tough game, but you have to put that behind you and get after it on the next game."

Asked how challenging it is to do that, Butler acknowledged that it's tough.

"Obviously we're playing on a big stage, big games every week, especially division games, and you want to go out and put your best foot forward every game," he said. "When you don't, you feel bad about it, but you have to move on."

When Butler reviewed his performance against the Jets, he felt his primary struggle came at the end of the play. He was often in position in coverage.

"Just finishing it," he said. "That's what matters at my position -- the end of it."